Tustin, CA Fire Regulations: Smoke Detectors (2026)

Smoke-alarm and carbon-monoxide-alarm requirements in Tustin are set by California statewide codes rather than a unique local ordinance. The City of Tustin adopts the California Building Standards Code (including the California Residential Code) by ordinance, in coordination with the Orange County Fire Authority, and enforces it through its Building Division. Under California's statewide standards, smoke alarms must be installed in each sleeping room (bedroom), outside each separate sleeping area in the immediate vicinity of the bedrooms, and on every story of the dwelling, including basements. When alterations, repairs, or additions requiring a permit occur, or when there is a change of use, existing dwellings must be brought up to these alarm standards. California Health and Safety Code requirements also mandate carbon monoxide (CO) alarms in dwelling units that have a fuel-burning appliance, a fireplace, or an attached garage; CO alarms are generally placed outside each sleeping area and on each level. State law further requires that battery-operated smoke alarms sold and installed contain a non-replaceable 10-year battery in many cases. Landlords are responsible for installing and maintaining required alarms in rental units, while tenants should notify the owner of any non-working device. Because these are state-mandated life-safety requirements adopted locally, they apply throughout Tustin regardless of a property's fire hazard zone. Residents should test alarms monthly and replace smoke alarms about every 10 years per manufacturer guidance.